https://www.scientificamerican.com/article/california-mandates-zero-emission-vehicles-at-airports/

California mandated a switch yesterday to nonpolluting shuttles and buses running short hops at its largest airports.

The California Air Resources Board unanimously passed the policy, the first of its kind in the nation. It requires by 2035 a switch to zero-emission vehicles at 13 airports: San Francisco, Los Angeles, San Diego, Sacramento, San Jose, Oakland and Ontario International, along with commuter airports in Orange County, Burbank-Hollywood, Long Beach, Palm Springs, Fresno and Santa Barbara.